Description
League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <iframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.
Published: 2026-10-08
Score: 5.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 08 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <iframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.
Title League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass
First Time appeared Thephpleague
Thephpleague commonmark
Weaknesses CWE-80
CPEs cpe:2.3:a:thephpleague:commonmark:-:*:*:*:*:*:*:*
Vendors & Products Thephpleague
Thephpleague commonmark
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}


Subscriptions

Thephpleague Commonmark
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-08T15:22:12.780Z

Reserved: 2026-10-05T21:59:09.591Z

Link: CVE-2026-105829

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-08T15:17:35.167

Modified: 2026-10-08T16:17:01.517

Link: CVE-2026-105829

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-08T17:00:17Z

Weaknesses